| 摘要 |
An embodiment of the present invention comprises: at least one light-emitting portion that emits light; a plurality of light-receiving portions, disposed at intervals in the passing direction of the moving object, that receive and detect light emitted from the light-emitting portion and reflected by the moving object; a holding portion that holds information indicating the passing direction of the moving object corresponding to a change in the detection outputs of the light-receiving portions occurring when the light-receiving portions receive the light reflected by the moving object; and a determination portion that determines the passing of the moving object based on the passing direction of the moving object as held by the holding portion and the detection outputs of the light-receiving portions occurring when the light-receiving portions receive the light reflected by the next moving object.
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